We have a warranty paper that goes with all of our cars, anything done outside of our knowledge is an insta-void.

The last thing we want to do is leave a customer hanging, which is why it's only one piece of paper with very easy to understand terms, and cars modified after the fact are also blackballed on the serial-number.

It negates the point to have a serial-numbered warrantied vehicle if you put a bunch of other things on it that don't really fit the original design of the car.